Pump



D. e. MILLER 7 2,484,387

Oct. 11, 1949.

PUMP

Filed July 27, 1945 ZorIaZa $212770? M a Attorneys Patented Oct. 11, 1949 UNITED STATES PATENTOFFICE PUMP 7 Donald G. Miller, Reno, Nev. V

Application July 27, 1945, Serial No. 607,404

5 Claims. (01. 103--37) This invention relates to a pump andparticularly to a high-pressure pump, it being one object of theinvention to provide a pump so constructed that when it is in operationpressure may be maintained at a constant degree and thereby cause fluiddischarge from the pump to be subjected to a constant pressure duringoperation of the pump.

Another object of the invention is to providea pump havin a pistonslidably mountedin a cylinder for reciprocating movement therein, the

cylinder being shiftable longitudinally and yield: ably held againstmovement in one direction so the cylinder that adjustments may be madeto regulate the amount of pressure which may be exerted by the pistonbefore the cylinder moves" with the piston to prevent excessive pressurebeing applied to the liquid.

Another object of the invention is to provide a pump so constructed thatit maintains the same pressure at any speed as long as the capacity islarge enough.

Another object of the invention is to so construct the pump that it willmaintain the prede termined pressure and at the same times does not pullon the source of power due to the fact that its spring pushes in favorof the powerduring half the revolution of the drive shaft.

Another objectof the invention is to provide a pressure-controlled pumpwhich is simple in construction, easily adjusted for predeterminedpressure, and not liable to get out of order when in use. panyingdrawings, wherein:

Figure 1 is a sectional view takenlongitudinally through the improvedpump,

Figure 2 is a sectional view taken along the line 22 of Figure 1,

Figure 3 is a sectional view upon an enlarged,

scale taken along the line 3-3 of Figure 1, and

Figure 4 is a view looking at one end of the pump.

This improved pump has a cylinder l formed with a longitudinallyextendingbore or chamber and havingthick walls so that it may with-'stand high pressure. The cylinder l is disposed horizontally andslidably mounted throughv an opening 3 formed in a standard 4 risingfrom a base 5. At its front end the cylinder is externally thickened toform a collar 6 for limiting sliding movement of the cylinder in onedirection and through this end portion of the cylinder The invention isillustrated in the accom- 2 are formed radially extending ports 1 and 8constituting an'inlet. and an outlet for the pump. Check valves 9 andII) are mounted in outer end portions of the ports'land 8, the valve 9being an inwardly opening valve and the valve I0 an outwardly openingvalve. These valves not only serve for controlling flow of fluid intoand out of the chamber 2 of the pump,-but also constitute nipples towhich pipes may be connected by flexible connections for leading liquidto and from the pump.

A piston l I is slidably received in the chamber 2 and in order toprevent leakage, the rear end of the cylinder has been provided with apack- 1 ing gland l2 by means of which packing I3 is compressed tightlyabout the piston. The rear end of the piston is pivoted to a pitman M bya pin l5 and at its rear end the pitman is formed with .a sleeve orcollar l6. which is circular in shape and fits about a circularcam-block ll carried by a drive shaft IS. The drive shaft is rotatablymounted through standard I!) carried by base 5 and rotary motion may beimparted to the shaft by a belt trained about a pulley 20 or in anyother desired manner. During rotation of the drive shaft, reciprocatingmovement is imparted to the piston and as this piston reciprocates inthe cylinder, liquid is drawn inwardly through the intake port-1 andexpelled through As pressure exerted by the piston increases duringforward movement of the piston in a power stroke, it is desired toprevent this pressure from increasing beyond a predetermined point.Therefore, the cylinder has been slidably mounted through the standard4. A shaft or plunger 2| extends forwardly from the front end of thecylinder. and slidably passes through a sleeve 22 which is slidablymounted through an opening 23 formed horizontally through a standard 24carried by the base. This sleeve serves as an adjustable abutment forone end of a helical spring 25 coiled about the plunger 2| and havingits rear end bearing against the front end of the cylinder, and whenpressure exerted by the forwardly moving piston reaches a predeterminedpoint, additional pressure will cause action of the spring 25 to beovercome and the cylinder will move forwardly with the piston.Therefore,the pressure may only be built up to a predetermined degree inthe chamber 2. At its front end the sleeve 22 fits into an opening 26formed through a lever 21 which is disposed vertically and has its.lower end pivotally mounted between the ears 28 ofa bracket 29 by a pinor shaft 30. The sleeve is held in the opening 26 by screws 3! which arethreaded through the lever from opposite side edges thereof and havetheir inner ends engaged in an annular groove 32 formed about the sleeveand from an inspection of GO Figure 1 it will be readily understood thatwhen the lever is swung longitudinally of the base 5, tension of thesprin 25 may be regulated so that the cylinder I will be prevented frommoving longitudinally in a forward direction until pressure within thechamber 2' is increased to such an extent that action of the spring isovercome. The bracket 29 is formed at its front end with an upstandinghead board 33 having a threaded opening formed near its upper end andthrough this opening passes an adjusting screw 34. The inner or rear endof screw 34 has abutting en'- gagement with lever 21 and by adjustingthis screw the lever may be prevented from swinging forwardly beyond aposition in which predetermined tension will be applied to the spring.By turning the screw in a loosening direction, the lever may bepermitted to move toward the position indicated by dotted lines inFigure 1 to decrease tension .up onv the spring and allow movement ofthe cylinder with the piston at a lower pressure and by turnin the screwin a tightening direction the lever may be swung toward standard 24 andthus increase tension upon the spring. The pump may therefore beaccurately set for any predetermined pressure.

It is thought that persons skilled in the art to which the inventionrelates will be able to obtain a clear understanding of the inventionafter considering the description in connection with the drawings.Therefore, a more lengthy description is regarded as unnecessary.

Minor changes inthe shape, size and arrangement of details coming withinthe field of invention claimed maybe resorted toin actual practice, ifdesired.

Having thus described the invention, what is claimed is:

1. A pressure-controlled pump comprising a cylinder mounted for slidingmovement, means on the ends of said cylinder for limiting its endwisemovement, a piston mounted for reciprocating movement in said cylinder,said piston being retained in said cylinder at all times, spring meansyieldably resisting movement of. the cylinder during movement. of thepiston in a power stroke, and pivoted means for regulating tension ofsaid spring and allowing movement of the cylinder with the piston whenpressure. exerted by the piston exceeds a predetermined degree.

2. A pressure-regulated pump comprising a support, a cylinder slidablelongitudinally through said support, a, piston mounted for reciprocatingmovement in. said cylinder, said piston being retained in said cylinderat all times, a bar extending from said, cylinder, a second support, asleeve shiftable longitudinally through the second support and. slidablyreceiving said bar, a spring about said bar between said sleeve and saidcylinder yieldably resisting movement of the cylinder during a powerstroke of the piston, and pivoted means for shifting said sleevelongitudinally to adjustedposition for placing the spring underpredetermined tension.

3. A pressure-regulated pump. comprising a base, a support carried bysaid base, a cylinder slidable longitudinally through said support, areciprocating piston operating in said cylinder, a second supportcarried by said base and formed with an opening, a sleeve shiftable.longitudinally through the second support, a bar extending from saidcylinder and, slid'ably engaged in said sleeve, 2. spring about said barbetween the cylinder and the confronting end of said sleeve, a

mounting carried by said base, a lever pivoted to said mounting andpivotally connected with said sleeve, and a set-screw carried by saidmounting and engaging said lever to limit movement of the lever awayfrom the second support and place said spring under predeterminedtension.

4. A pressure-regulated pump comprising a base, a support extendingupwardly from said base, a cylinder slidable longitudinally through saidsupport, a piston mounted for reciprocatingmovement'in, said cylinderthrough the rear end thereof, bearings carried by said base, a driveshaft rotatably carried by said bearings, a cam disc carried by saiddrive shaft, a pitman about said cam disc pivoted to the rear end ofsaid piston for reciprocating the piston during rotation of thedrive'shaft, a second support carried by said base; forwardly of thefirst support, a sleeve slidable through the second support, a, barextending forwardly from the front end of said cylinder andslidablyreceived in said sleeve, a spring about said bar having its ends inabutting engagement with: the front end of the cylinder andthe rearendof the sleeve, a mounting bracket. carried by said base forwardly of thesecond support and having ears spaced transversely from each other and ahead board extending upwardly above its ears, a lever pivotally mountedat its lower. end between said ears and having its upper portion formedwith an opening into which the forward end of said sleeve extends,screws passing through said lever from opposite side faces thereof withtheir inner ends engaging in a circumferentially extending seat adjacentthe front end of said sleeve, and a setscrew threaded through the headboard with its inner end abutting. said lever to limit forward movementof the lever and apply predetermined tension to said. spring- 5. Apressure-regulated pump comprising a base, a support extending upwardlyfrom said base, a cylinder slidable through said support in a directionlongitudinally of the base, a piston mounted for reciprocating movementin the cylinder through the rear end, thereof, drive means carried bysaid base and connected with the rear end. of said piston, a secondsupport carried by said base forwardly of the first support, a barextending forwardly'from the front end of said cylinder, a sleeveslidable through said second support in a direction longitudinall of thebase and slidably receiving said bar, a spring about said bar betweenthe front end of the cylinder and the rear end of said sleeve, amounting carried by said base forwardly of the second support, a leverdisposed vertically with its lower end pivoted to said mounting andhaving its upper portion pivotally connected with the forward end ofsaid sleeve and an abutment adjustably carried by said mounting forengagement by said lever to limit forward movement of the lever andcontrol tension of the spring. DONALD G. MILLER.

REFERENCES CITED The following, references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,932,921 Bizzarri Oct. 31, 19332,038,311 Paisons Apr. 21, 1936

